JP5058143B2 - Oil-free scroll compressor - Google Patents

Description

  The present invention relates to a scroll compressor that compresses air, and more particularly to an oil-free scroll compressor that injects water without injecting oil into a compression chamber.

  As an example of a compressor that compresses air, an oil-free compressor that does not inject oil (lubricating oil) into a compression chamber is known, and this oil-free compressor requires clean compressed air that does not contain oil. In the food industry and semiconductor manufacturing field. However, an oil-free compressor has problems in terms of performance and reliability because it has lower compression efficiency and a shorter maintenance cycle than an oil supply type compressor that injects oil into a compression chamber. Therefore, in order to solve such a problem, for example, an oil-free screw compressor in which water is injected into the compression chamber to enhance the cooling and sealing effect has been put into practical use.

  On the other hand, an oil-free scroll compressor that injects water into a compression chamber has also been proposed for scroll compressors having advantages such as low noise and low vibration (see, for example, Patent Document 1). In this Patent Document 1, an orbiting scroll member provided with substantially spiral wraps on both sides, and a fixed scroll member on one side provided with substantially spiral wraps corresponding to one side of the orbiting scroll member on one side; In the double-tooth scroll compressor provided with a substantially scroll-like wrap corresponding to the wrap on the other side of the orbiting scroll member and the fixed scroll member on the other side, formed on the fixed scroll member on the one side Water is injected into a compression chamber formed on one side of the orbiting scroll member through the opening, and formed on the other side of the orbiting scroll member through an opening formed in the fixed scroll member on the other side. A water injection system for injecting water into the compression chamber. The water injection system includes a liquid tank for storing water, a pump device connected to the liquid tank, a pipe branched from the discharge side of the pump device and connected to the opening of the fixed scroll member on one side, A valve device provided in the pipe, a pipe branched from the discharge side of the pump device and connected to the opening of the fixed scroll member on the other side, and a valve device provided in the pipe.

JP-A-8-128395 (see FIG. 10 and the like)

  However, there are the following problems in the above-described prior art. The oil-free scroll compressor described in Patent Document 1 discloses a water injection system that injects water into the compression chambers on one side and the other side. However, the amount of water to be injected into the compression chamber on one side and the water injection system on the other side are disclosed. The balance control with the amount of water injected into the compression chamber, that is, the balance control between the temperature of the compression chamber on one side and the temperature of the compression chamber on the other side is not clearly described. Compared with a screw compressor, the scroll compressor has a greater design compensation for thermal deformation or the like due to a difference in compression form. Therefore, if a temperature difference occurs between the compression chamber on one side and the compression chamber on the other side and the balance of thermal deformation is lost, there is a risk that a lap contact accident will occur.

  Further, in the oil-free scroll compressor described in Patent Document 1, the timing of water injection at the start of operation and at the end of operation of the compressor is not clearly described. Therefore, depending on the timing of water injection, excessive water is present in the compression chamber, which may cause liquid compression and break the wrap.

  An object of the present invention is to provide an oil-free scroll compressor that can prevent breakage of a wrap and improve reliability.

  (1) In order to achieve the above object, the present invention provides a orbiting scroll member having a substantially spiral wrap, a fixed scroll member having a substantially spiral wrap corresponding to the wrap of the orbiting scroll member, and the fixed A motor that generates a driving force for rotating the orbiting scroll member with respect to the scroll member, and has a plurality of compression paths from the suction port to the discharge port, and injects water into the plurality of compression paths. The oil-free scroll compressor includes a temperature detection unit that detects temperatures of at least two compression paths, and a water amount adjustment unit that adjusts the amount of water injected into each of the plurality of compression paths, and the water amount adjustment unit includes: In each of the plurality of compression paths, the deviation in temperature of at least two compression paths detected by the temperature detection means is reduced. Adjusting the ratio of infusion to water.

  Thus, in the present invention, at least two compression paths (specifically, for example, two compression paths formed on both sides of the orbiting scroll member in a double-tooth scroll compressor, for example, the diameter of the wrap of the orbiting scroll member) The temperature of two compression paths formed on the inner side in the direction and the outer side in the radial direction) is detected, and the ratio of the amount of water injected into each of the plurality of compression paths is adjusted so that the deviation between these temperatures becomes small. And since the temperature deviation in a some compression path | route becomes small, the balance of a thermal deformation can be maintained and generation | occurrence | production of a lap contact accident can be prevented. Therefore, breakage of the wrap can be prevented and reliability can be improved.

  (2) In the above (1), preferably, the temperature detecting means is constituted by a temperature sensor that outputs detected temperatures of at least two compression paths as an electric signal, and the water amount adjusting means is provided in the plurality of compression paths. And an adjustment valve capable of adjusting the ratio of the amount of water to be injected into each, and calculating the opening of the adjustment valve based on an input signal from the temperature sensor so that the deviation in the detected temperature of at least two compression paths is small And a control device that outputs a control signal corresponding to the regulating valve.

  (3) In the above (1), preferably, the temperature detecting means is composed of two temperature sensing tubes filled with working gases that sense the temperatures of the two compression paths, respectively, and the water amount adjusting means is The amount of water injected into each of the plurality of compression paths so that a deviation in the temperature of the two compression paths is reduced by operating the valve body by the pressure difference between the working gases introduced from the two temperature sensing cylinders. It has an automatic adjustment valve that adjusts the ratio.

  (4) In any one of the above (1) to (3), preferably, the apparatus includes a motor control unit that starts driving the motor in response to a command to start compressor operation, Water injection into the plurality of compression paths is started after a predetermined time has elapsed since the motor control unit started driving the motor.

  In the initial stage of operation of the compressor, the temperature of the compression path is usually low. Therefore, for example, in response to an instruction to start compressor operation, when driving the motor and simultaneously injecting water into the compression path, water (liquid) is excessively retained in the compression path, Liquid compression may occur and damage the wrap. In the present invention, water injection into the compression path is started after a lapse of a predetermined time from the start of driving of the motor, that is, after the temperature of the compression path has sufficiently increased. Thereby, it is possible to prevent breakage of the wrap due to liquid compression without excessive retention of water in the compression path. Therefore, reliability can be improved.

  (5) In any one of the above (1) to (4), preferably, the water amount adjusting means stops injecting water into the plurality of compression paths in response to a compressor operation end command. Motor control means for stopping the driving of the motor after elapse of a predetermined time after water injection into the plurality of compression paths is stopped by the water amount adjusting means.

  For example, in response to a command to end the compressor operation, when water injection into the compression path is stopped and at the same time the motor drive is stopped, excessive water (liquid) remains in the compression path. As the operation resumes, liquid compression may occur and break the wrap. In the present invention, the drive of the motor is stopped after a lapse of a predetermined time after water injection into the plurality of compression paths is stopped, that is, after the water in the compression paths is sufficiently removed. Thereby, it is possible to prevent breakage of the wrap due to liquid compression without excessive water remaining in the compression path. Therefore, reliability can be improved.

  (6) In order to achieve the above object, the present invention provides a orbiting scroll member having a substantially spiral wrap, a fixed scroll member having a substantially spiral wrap corresponding to the wrap of the orbiting scroll member, and the fixed A motor that generates a driving force for rotating the orbiting scroll member with respect to the scroll member, and has a plurality of compression paths from the suction port to the discharge port, and injects water into the plurality of compression paths. In the oil-free scroll compressor, motor control means for starting driving of the motor in response to an instruction to start compressor operation, and elapse of a predetermined time after the motor driving is started by the motor control means And a water amount adjusting means for starting injection of water into the plurality of compression paths.

  (7) In order to achieve the above object, the present invention provides a orbiting scroll member having a substantially spiral wrap, a fixed scroll member having a substantially spiral wrap corresponding to the wrap of the orbiting scroll member, and the fixed A motor that generates a driving force for rotating the orbiting scroll member with respect to the scroll member, and has a plurality of compression paths from the suction port to the discharge port, and injects water into the plurality of compression paths. In the oil-free scroll compressor, water amount adjusting means for stopping the injection of water into the plurality of compression paths in response to a command to end the compressor operation, and water into the plurality of compression paths by the water amount adjusting means. Motor control means for stopping the driving of the motor after elapse of a predetermined time after the injection is stopped.

  According to the present invention, breakage of a wrap can be prevented and reliability can be improved.

  Embodiments of the present invention will be described below with reference to the drawings.

  FIG. 1 is a schematic diagram showing the overall configuration of the oil-free scroll compressor according to the first embodiment of the present invention (note that the compressor body is shown as a front view). FIG. 2 is a horizontal sectional view of the compressor main body showing the detailed structure of the compressor main body together with the arrangement of the temperature sensor. FIG. 3 is a rear view of the fixed scroll member constituting the compressor body (however, for convenience, the positional relationship of the wrapping of the orbiting scroll member is also shown).

  1 to 3, the oil-free scroll compressor is driven by a motor (not shown) to compress air and injects water into the compression chamber of the compressor body 1. A water injection system (details will be described later) for separating and recovering moisture in the compressed air discharged from the compressor body 1 is provided. Thus, by injecting water into the compression chamber of the compressor main body 1, the cooling and sealing effect is enhanced.

  The compressor main body 1 is a double-tooth scroll compressor, and has a revolving scroll member 2 provided with substantially spiral wraps 2a and 2b on both surfaces (the lower and upper surfaces in FIG. 2) of the end plate portion 2c. Fixing in which a substantially spiral wrap 3a corresponding to the wrap 2a of the scroll member 2 (specifically, meshing without contacting the wrap 2a) is provided on one surface (upper surface in FIG. 2) of the end plate portion 3b. A substantially spiral wrap 4a corresponding to the scroll member 3 and the wrap 2b of the orbiting scroll member 2 (specifically, meshing without contacting the wrap 2b) is provided on one side (lower side in FIG. 2). And a fixed scroll member 4 provided on the surface. The fixed scroll members 3 and 4 are combined with each other to form a housing containing the orbiting scroll member 2.

  The compressor body 1 also includes a main crankshaft 5 and an auxiliary crankshaft 6 that cause the orbiting scroll member 2 to orbit with respect to the fixed scroll members 3 and 4. The main crankshaft 5 is rotatably supported by bearings 7A and 8A provided on the fixed scroll members 3 and 4, and the auxiliary crankshaft 6 is rotatable by bearings 7B and 8B provided on the fixed scroll members 3 and 4. It is supported by. The main crankshaft 5 and the auxiliary crankshaft 6 each have shaft end portions protruding from the fixed scroll member 3, and pulleys 9A and 9B are provided at these shaft end portions. The timing belt 10 is mounted on the pulleys 9A and 9B so that the main crankshaft 5 and the auxiliary crankshaft 6 rotate synchronously. A V pulley 11 is provided at the shaft end of the main crankshaft 5, and a V belt (not shown) is provided between the V pulley 11 and a V pulley (not shown) provided on the rotating shaft of the motor. ) Is mounted so that the rotational power of the motor is transmitted to the main crankshaft 5.

  The main crankshaft 5 has a crank portion 5 a connected to one side (the right side in FIG. 2) of the radially outer peripheral portion of the orbiting scroll member 2, and the auxiliary crankshaft 6 is the radially outer peripheral portion of the orbiting scroll member 2. 2 has a crank portion 6a connected to the other side (left side in FIG. 2). The crank portion 5a of the main crankshaft 5 and the crank portion 6a of the auxiliary crankshaft 6 are eccentric with the same amount of eccentricity from the axis, and the orbiting scroll member 2 orbits through the bearings 12A and 12B in these crank portions 5a and 6a. It is supported so that it can move. In addition, in order to cancel out the unbalance due to the orbiting motion of the orbiting scroll member 2, the main crankshaft 5 is provided with a balance weight 13A, and the auxiliary crankshaft 6 is provided with a balance weight 13B.

  The fixed scroll member 3 includes the wrap 3a, the end plate portion 3b, a substantially circular dust wrap 3c provided on the outer peripheral side of the wrap 3a in the end plate portion 3b, and a radially inner side (in other words, in other words) For example, it has two suction ports 3d and 3e that communicate between the outside of the wrap 3a in the radial direction) and the outside, and a discharge port 3f that communicates the central portion of the wrap 3a in the radial direction with the outside. Then, between the orbiting scroll member 2 and the fixed scroll member 3, a compression path 14 </ b> A (which mainly sucks and compresses air from the suction port 3 d and discharges it from the discharge port 3 f in accordance with the orbiting motion of the orbiting scroll member 2. Specifically, a plurality of compression chambers are formed which are formed on the radially inner side of the wrap 2a of the orbiting scroll member 2 and move toward the discharge port 3f while reducing the volume as the orbiting scroll member 2e rotates. In addition, a compression path 14B (mainly formed on the radially outer side of the wrap 2a of the orbiting scroll member 2 is formed by sucking and compressing air from the inlet 3e and compressing the air through the outlet 3f. As a result of the rotation, a plurality of compression chambers that move toward the discharge port 3f while reducing the volume are formed.

  Similarly, the fixed scroll member 4 includes the wrap 4a, the end plate portion 4b, a substantially circular dust strap 4c provided on the outer peripheral side in the radial direction of the wrap 4a in the end plate portion 4b, and the radial direction of the dust strap 4c. There are two suction ports 4d and 4e that communicate the inside (in other words, the radially outer side of the wrap 4a) and the outside, and a discharge port 4f that communicates the radial center of the wrap 4a and the outside. Then, between the orbiting scroll member 2 and the fixed scroll member 4, a compression path 15 </ b> A (which mainly sucks and compresses air from the suction port 4 d and discharges it from the discharge port 4 f in accordance with the orbiting motion of the orbiting scroll member 2. Specifically, a plurality of compression chambers are formed which are formed on the radially inner side of the wrap 2a of the orbiting scroll member 2 and move toward the discharge port 4f while reducing the volume as the orbiting scroll member 2e rotates. In addition, a compression path 15B (in detail, formed on the radially outer side of the wrap 2a of the orbiting scroll member 2 and sucking and compressing air from the suction port 4e and discharging it from the discharge port 4f, is provided. As a result of the rotation, a plurality of compression chambers that move toward the discharge port 4f while reducing the volume are formed.

  The water injection system of this embodiment includes a water separator 16 that separates and recovers moisture in the compressed air discharged from the discharge ports 3f and 4f of the compressor body 1, and cooling that cools the water recovered by the separator 16. , A purifier 18 for removing harmful components in the water cooled by the cooler 17, and a water injection system 19 for injecting water supplied from the purifier 18 into the compression flow paths 14A, 14B, 15A, 15B, respectively. And.

  The water injection system 19 includes a flow divider 20 that diverts water supplied from the cleaning device 18, a flow divider 22A that is connected to one outlet of the flow divider 20 via a regulating valve 21A, and a flow divider 22A. A water injection pipe (in other words, a water injection pipe mainly for water injection into the compression flow path 14A) 23A connected so as to inject water into the suction port 3d from one side outlet, and water injection from the other side outlet of the flow divider 22A to the suction port 3e. A water injection pipe (in other words, a water injection pipe for mainly injecting water into the compression flow path 14B) 23B, a flow divider 22B connected to the other side outlet of the flow divider 20 via a regulating valve 21B and diverted, and the flow divider Water injection pipe 23C (in other words, water injection pipe mainly for water injection into the compression flow path 15A) 23C connected so as to inject water into the suction port 4d from one side outlet of 22B and water injection from the other side outlet of the flow divider 22B to the suction port 4e You (In other words, the water injection tube: 6.3 primarily the compression channel 15B) connected to the water injection tube as configured in the 23D. And the opening degree of the regulating valves 21A and 21B is controlled by the control device 24 so that the ratio between the amount of water injected into the compression flow paths 14A and 14B and the amount of water injected into the compression flow paths 15A and 15B is adjusted. It has become.

  A temperature sensor 25A is provided in the vicinity of the discharge port 3f of the fixed scroll member 3. The temperature sensor 25A detects, for example, the temperature of the discharge path 14A (specifically, the air in the compression chamber immediately before communicating with the discharge port 3f). The temperature is detected via the end plate portion 3b, and the detected temperature is output as a detection signal (electric signal). Further, a temperature sensor 25B is provided in the vicinity of the discharge port 4f of the fixed scroll member 4, and this temperature sensor 25B detects, for example, the temperature of the discharge path 15B (specifically, the compression chamber immediately before communicating with the discharge port 4f). Is detected via the end plate part 4b, and the detected temperature is output as a detection signal (electric signal).

  As a first control function, the control device 24 inputs detection signals from the temperature sensors 25A and 25B, and based on these signals, the control valve 24 adjusts the deviation between the temperature of the compression path 14A and the temperature of the compression path 15B to be small. The opening degree of 21A, 21B is calculated, and the corresponding control signal is output to the regulating valves 21A, 21B. Further, the control device 24 has, as a second control function, for example, adjusting valves 21A and 21B in accordance with ON / OFF signals (compression operation start / operation command signals) from an operation switch (not shown). And the motor is controlled. The control procedure of the control device 24 will be described with reference to FIG. FIG. 4 is a flowchart showing the contents of control processing of the control device 24.

  In FIG. 4, first, in step 100, it is determined whether or not the operation switch has been switched from the OFF state to the ON state. For example, when the operation switch cannot be switched to the ON state, the determination in step 100 is not satisfied, and this determination is repeatedly performed. On the other hand, for example, when the operation switch is switched to the ON state, the determination in step 100 is satisfied, and the routine proceeds to step 110. In step 110, driving of the motor is started. Then, the process proceeds to step 120, where it is determined whether or not a predetermined time (about several tens of seconds) set in advance has elapsed since the start of motor driving. While the predetermined time has not elapsed, the determination in step 120 is not satisfied and the determination is repeated. Thereafter, when a predetermined time has elapsed, the determination at step 120 is satisfied, and the routine proceeds to step 130. In step 130, the regulating valves 21A and 21B are switched from the closed state to the opened state (preset initial opening).

  Then, the process proceeds to step 140, where the deviation between the temperature of the compression path 14A and the temperature of the compression path 15B is calculated based on the detection signals from the temperature sensors 25A, 25B, and the adjustment valves 21A, 21B are reduced so that this deviation becomes smaller. The correction amount of the opening is calculated, and then the process proceeds to step 150 to output a corresponding control signal to the adjusting valves 21A and 21B to adjust the opening of the adjusting valves 21A and 21B. Specifically, for example, when the temperature of the compression path 14A is higher than the temperature of the compression path 15B, the opening degree of the adjusting valve 21A is increased or the opening degree of the adjusting valve 21B is decreased according to the deviation. As a result, the amount of water injected into the compression paths 14A and 14B increases or the amount of water injected into the compression paths 15A and 15B decreases. Further, for example, when the temperature of the compression path 15B is higher than the temperature of the compression path 14A, the opening degree of the regulating valve 21B is increased or the opening degree of the regulating valve 21A is reduced according to the deviation. As a result, the amount of water injected into the compression paths 15A and 15B increases or the amount of water injected into the compression paths 14A and 14B decreases.

  Then, it progresses to step 160 and it is determined whether the operation switch was switched from ON state to OFF state. For example, when the operation switch cannot be switched to the OFF state, the determination of step 160 is not satisfied, and the above-described steps 140 and 150 are repeated. On the other hand, for example, when the operation switch is switched to the OFF state, the determination at step 160 is satisfied, and the routine proceeds to step 170. In step 170, the regulating valves 21A and 21B are switched from the open state to the closed state. Then, the process proceeds to step 180, and after the adjustment valves 21A and 21B are switched to the closed state (in other words, after the water injection to the compression paths 14A, 14B, 15A and 15B is stopped), a predetermined time (several tens of times) is set. It is determined whether or not (seconds) has elapsed. While the predetermined time has not elapsed, the determination in step 180 is not satisfied and the determination is repeated. Thereafter, when a predetermined time has elapsed, the determination at step 180 is satisfied, and the routine goes to step 190. In step 190, the drive of the motor is stopped. Thereafter, returning to step 100 described above, the same procedure is repeated.

  In the present embodiment configured as described above, the temperatures of the compression paths 14A and 15B are detected, and the amount of water injected into the compression paths 14A and 14B and the compression paths 15A and 15B are reduced so that the deviation between the detected temperatures becomes small. Adjust the ratio with the amount of water to be injected. In this way, the temperature deviation in the compression paths 14A, 14B, 15A, 15B is reduced, so that the balance of thermal deformation can be maintained, and the occurrence of a lap contact accident can be prevented. Therefore, breakage of the wrap can be prevented and reliability can be improved. Moreover, it becomes possible to make the clearance dimension between the turning scroll member 2 and the fixed scroll members 3 and 4 smaller, and to improve the compression performance.

  Further, in the present embodiment, when starting the compressor operation, after a predetermined time has elapsed since the start of driving of the motor, that is, after the temperature of the compression paths 14A, 14B, 15A, 15B has sufficiently increased, Water injection into the compression paths 14A, 14B, 15A, 15B is started. In addition, at the end of the compressor operation, after a lapse of a predetermined time after water injection into the compression paths 14A, 14B, 15A, 15B is stopped, that is, sufficient water in the compression paths 14A, 14B, 15A, 15B After being removed, the motor is stopped. Thereby, it is possible to prevent breakage of the wrap due to liquid compression without excessive retention of water in the compression path. Therefore, reliability can be improved.

  In the first embodiment, the control device 24 calculates the deviation between the temperature of the compression path 14A and the temperature of the compression path 15B as shown in steps 130 to 150 of FIG. In the above description, the correction amount of the opening degree of the adjustment valves 21A and 21B is calculated so that becomes smaller, and the corresponding control signal is output to the adjustment valves 21A and 21B. However, the present invention is not limited to this. That is, for example, as indicated by steps 200 and 150 in FIG. 5, the control device 24 stores a preset target temperature, calculates a deviation between the detected temperature of the compression path 14A and the target temperature, and this deviation. Even if the opening degree of the regulating valve 21A is controlled so that the deviation becomes smaller, the deviation between the detected temperature of the compression path 15B and the target temperature is calculated, and the opening degree of the regulating valve 21B is controlled so that this deviation becomes smaller. Good. Also in such a case, the temperature deviation in the compression paths 14A and 15B becomes small, and the same effect as described above can be obtained.

  In the first embodiment, temperature sensors 25A and 25B that detect the temperatures of the compression paths 14A and 15B are provided, respectively, and the water injection system 19 supplies the amount of water injected into the compression paths 14A and 14B and the compression paths 15A and 15B. Although the configuration has been described as an example in which the ratio with the amount of water to be injected is adjustable, the configuration is not limited thereto. That is, it is possible to change the number of temperature sensors, the compression paths to be detected, and the configuration of the water injection system as long as they do not depart from the gist of the present invention.

  For example, in the modification shown in FIGS. 6 and 7, temperature sensors 26A, 26B, 26C, and 26D that detect the temperatures of the compression flow paths 14A, 14B, 15A, and 15B, respectively, are provided. The water injection system 19A includes a flow divider 27 for diverting the water supplied from the cleaning device 17, and a water injection pipe (in other words, mainly connected to the water inlet 3d from the first outlet of the flow divider 27). 28A and a water injection pipe (in other words, a water injection pipe mainly for water injection into the compression flow path 14B) 28B connected so as to be supplied from the second outlet of the flow divider 27 to the suction port 3e. And a water injection pipe (in other words, a water injection pipe mainly for water injection into the compression flow path 15A) 28C connected so as to inject water from the third outlet of the flow divider 27 to the suction port 4d, and suction from the fourth outlet of the flow distributor 27. A water injection pipe (in other words, a water injection pipe mainly injected into the compression flow path 15B) 28D connected so as to inject water into the port 4e, and adjustment valves 29A to 29D provided in the water injection pipes 28A to 28D, respectively. And The ratio of the amount of water injected into the compression paths 14A, 14B, 15A, and 15B can be adjusted. Then, the control device 24A receives detection signals from the temperature sensors 26A to 26D, and based on these signals, the opening degrees of the adjustment valves 29A to 29D so that the deviations in the temperatures of the compression paths 14A, 14B, 15A, and 15B become small. And corresponding control signals are output to the regulating valves 29A to 29D. Even in such a modification, the same effect as described above can be obtained.

  A second embodiment of the present invention will be described with reference to FIGS. This embodiment is an embodiment in which an automatic adjustment valve is provided in a water injection system. In addition, the same code | symbol is attached | subjected to the part equivalent to the said 1st Embodiment, and description is abbreviate | omitted suitably.

  FIG. 8 is a schematic diagram illustrating the overall configuration of the scroll compressor according to the present embodiment. FIG. 9 is a diagram illustrating a detailed structure of the automatic adjustment valve.

  The water injection system 19B of the present embodiment is connected to an automatic adjustment valve 31 for diverting water supplied from the cleaning device 18 via the on-off valve 30 and an outlet on one side (an outlet 33b described later) of the automatic adjustment valve 31. A diverter 22A that divides and diverts, a water injection pipe 23A connected so as to inject water into the suction port 3d from one side outlet of the diversion device 22A, and a connection so as to inject water into the suction port 3e from the other side outlet of the diversion device 22A. Connected to the other side outlet (outlet port 33c described later) of the automatic adjustment valve 31, and to connect water from the one side outlet of the flow divider 22B to the inlet 4d. The water injection pipe 23C and the water injection pipe 23D connected so as to inject water from the other side outlet of the flow divider 22B to the suction port 4e.

  In the vicinity of the discharge port 3f of the fixed scroll member 3, a temperature sensitive cylinder 32A in which a low-boiling working gas (such as chlorofluorocarbon) is sealed is provided. The working gas in the temperature sensitive cylinder 32A is, for example, a discharge path 14A. The temperature changes according to the temperature (specifically, the temperature of the compression chamber immediately before communicating with the discharge port 3f), and the pressure fluctuates. A temperature sensing cylinder 32B in which a low boiling point working gas (such as chlorofluorocarbon) is sealed is provided in the vicinity of the discharge port 4f of the fixed scroll member 4. The working gas in the temperature sensing cylinder 32B is, for example, discharged The temperature changes according to the temperature of the path 15B (specifically, the temperature of the compression chamber immediately before communicating with the discharge port 4f), and the pressure changes.

  The automatic adjustment valve 31 includes a main cylinder (housing) 33 in which an inlet 33a and outlets 33b and 33c are formed, a movable bar (valve element) 34 that is slidable in the main cylinder 33, and a capillary tube 35A. A pressure receiving part 36A for introducing the working gas from the temperature sensing cylinder 32A and a pressure receiving part 36B for introducing the working gas from the temperature sensing cylinder 32B via the capillary tube 35B are provided. The pressure receiving part 36A has a diaphragm 37A that is displaced by the pressure of the working gas introduced from the temperature sensing cylinder 32A, and the pressure receiving part 36B has a diaphragm 37B that is displaced by the pressure of the working gas introduced from the temperature sensing cylinder 32B. The diaphragms 37A and 37B are connected to both ends of the movable bar 34. As a result, the movable bar 34 has the outlet 33b side (left side in FIG. 9) or the outlet 33c depending on the pressure difference between the working gases of the temperature sensing cylinders 32A and 32B (in other words, the temperature difference between the compression paths 14A and 15B). It slides to the side (right side in FIG. 9), and the opening degree of the outflow ports 33b and 33c is adjusted.

  Specifically, for example, when the pressure of the working gas in the pressure receiving portion 36A is higher than the pressure of the working gas in the pressure receiving portion 36B (in other words, when the temperature of the compression path 14A is higher than the temperature of the compression path 15B), the pressure difference Accordingly, the movable bar slides toward the outlet 33c to increase the opening of the outlet 33b and decrease the opening of the outlet 33c. Thereby, the amount of water injected into the compression paths 14A and 14B increases, and the amount of water injected into the compression paths 15A and 15B decreases. Further, for example, when the pressure of the working gas in the pressure receiving portion 36B is higher than the pressure of the working gas in the pressure receiving portion 36A (in other words, when the temperature of the compression path 15B is higher than the temperature of the compression path 14A), it is movable according to the pressure difference. The bar slides toward the outlet 33b to increase the opening of the outlet 33c and decrease the opening of the outlet 33b. Thereby, the amount of water injected into the compression paths 15A and 15B increases, and the amount of water injected into the compression paths 14A and 14B decreases. Therefore, the amount of injected water is automatically adjusted so that the temperature of the compression path 14A and the temperature of the compression path 15B become the same. As a result, the temperature deviation in the compression paths 14A, 14B, 15A, and 15B is reduced, the balance of thermal deformation can be maintained, and the occurrence of a lap contact accident can be prevented.

  The control device 38 controls the on-off valve 30 and the motor in accordance with, for example, an ON / OFF signal from the operation switch (compression operation start / end command signal). Specifically, for example, when the operation switch is switched to the ON state, the motor starts to be driven, and then the on-off valve 30 is fully closed after a predetermined time (about several tens of seconds) has elapsed. To fully open state. For example, when the operation switch is switched to the OFF state, the on-off valve 33 is switched from the fully open state to the fully closed state, and then the motor is driven when a predetermined time (about several tens of seconds) elapses. Stop. As a result, it is possible to prevent breakage of the wrap due to liquid compression without excessive retention of water in the compression path.

  In the present embodiment configured as described above, similarly to the first embodiment, breakage of the wrap can be prevented and reliability can be improved. Moreover, it becomes possible to make the clearance dimension between the turning scroll member 2 and the fixed scroll members 3 and 4 smaller, and to improve the compression performance. Moreover, in this embodiment, by setting it as the structure provided with the automatic adjustment valve 31, cost reduction can be aimed at compared with the said 1st Embodiment.

  In the above description, the double-tooth scroll compressor has been described as an application target of the present invention. However, the present invention is not limited to this, and may be applied to, for example, a single-tooth scroll compressor. That is, the temperature of the two compression paths formed respectively on the radially inner side and the radially outer side of the wrap of the orbiting scroll member is detected, and the amount of water injected into each of the two compression paths is reduced so that the deviation between these temperatures becomes small. The proportion may be adjusted. In this case, the same effect as described above can be obtained.

It is a schematic diagram showing the whole oil free scroll compressor composition in a 1st embodiment of the present invention. It is a horizontal sectional view of the compressor main body showing the detailed structure of the compressor main body in the 1st Embodiment of this invention with arrangement | positioning of a temperature sensor. It is a rear view of the fixed scroll member which comprises the compressor main body in the 1st Embodiment of this invention. It is a flowchart showing the control processing content of the control apparatus in the 1st Embodiment of this invention. It is a flowchart showing the control processing content of the control apparatus in one modification of this invention. It is the schematic showing the whole structure of the oil-free scroll compressor in the other modification of this invention. It is a cross-sectional view of the compressor main body showing arrangement | positioning of the temperature sensor in the other modification of this invention. It is the schematic showing the whole structure of the scroll compressor in the 2nd Embodiment of this invention. It is the schematic showing the detailed structure of the automatic adjustment valve in the 2nd Embodiment of this invention.

Explanation of symbols

2 orbiting scroll members 2a and 2b wrap 3 fixed scroll member 3a wraps 3d and 3e suction port 3f discharge port 4 fixed scroll member 4a wraps 4d and 4e suction port 4f discharge ports 14A and 14B compression paths 15A and 15B compression paths 21A and 21B adjustment Valve (water volume adjustment means)
24 Control device (water volume adjustment means, motor control means)
24A control device (water amount adjusting means, motor control means)
25A, 25B Temperature sensor (temperature detection means)
26A-26D Temperature sensor (temperature detection means)
29A-29D Adjusting valve (water volume adjusting means)
30 On-off valve (water volume adjusting means)
31 Automatic adjustment valve (water volume adjustment means)
32A, 32B Temperature sensing tube (temperature detection means)
38 Control device (water volume adjustment means, motor control means)

Claims (7)

A orbiting scroll member having a substantially spiral wrap, a fixed scroll member having a substantially spiral wrap corresponding to the wrap of the orbiting scroll member, and for orbiting the orbiting scroll member relative to the fixed scroll member An oil-free scroll compressor having a plurality of compression paths from a suction port to a discharge port, and injecting water into the plurality of compression paths.
Temperature detecting means for detecting temperatures of at least two compression paths;
Water amount adjusting means for adjusting the amount of water injected into each of the plurality of compression paths,
The water amount adjusting means adjusts a ratio of the amount of water injected into each of the plurality of compression paths so that a deviation in temperature of at least two compression paths detected by the temperature detecting means becomes small. Oil-free scroll compressor.   2. The oil-free scroll compressor according to claim 1, wherein the temperature detecting unit is configured by a temperature sensor that outputs detected temperatures of at least two compression paths as an electric signal, and the water amount adjusting unit is disposed in the plurality of compression paths. And an adjustment valve capable of adjusting the ratio of the amount of water to be injected into each, and calculating the opening of the adjustment valve based on an input signal from the temperature sensor so that the deviation in the detected temperature of at least two compression paths is small An oil-free scroll compressor, comprising: a control device that outputs a control signal corresponding to the regulating valve.   2. The oil-free scroll compressor according to claim 1, wherein the temperature detection unit includes two temperature-sensitive cylinders filled with working gases that respectively sense the temperatures of two compression paths, and the water amount adjustment unit includes the water amount adjustment unit. The amount of water injected into each of the plurality of compression paths so that a deviation in the temperature of the two compression paths is reduced by operating the valve body by the pressure difference between the working gases introduced from the two temperature sensing cylinders. An oil-free scroll compressor characterized by having an automatic adjustment valve for adjusting the ratio of the oil.   The oil-free scroll compressor according to any one of claims 1 to 3, further comprising motor control means for starting driving of the motor in response to an instruction to start compressor operation, wherein the water amount adjusting means is the motor control. An oil-free scroll compressor characterized by starting water injection into the plurality of compression paths after elapse of a predetermined time after the motor starts to be driven by the means.   The oil-free scroll compressor according to any one of claims 1 to 4, wherein the water amount adjusting means stops injection of water into the plurality of compression paths in response to a command to end compressor operation. And an oil-free motor control means for stopping driving of the motor after elapse of a predetermined time after water injection into the plurality of compression paths is stopped by the water amount adjusting means. Scroll compressor. A orbiting scroll member having a substantially spiral wrap, a fixed scroll member having a substantially spiral wrap corresponding to the wrap of the orbiting scroll member, and for orbiting the orbiting scroll member relative to the fixed scroll member An oil-free scroll compressor having a plurality of compression paths from a suction port to a discharge port, and injecting water into the plurality of compression paths.
Motor control means for starting driving of the motor in response to a command to start compressor operation;
And a water amount adjusting means for starting injection of water into the plurality of compression paths after elapse of a predetermined time after the motor control means starts driving the motor. Oil-free scroll compressor. A orbiting scroll member having a substantially spiral wrap, a fixed scroll member having a substantially spiral wrap corresponding to the wrap of the orbiting scroll member, and for orbiting the orbiting scroll member relative to the fixed scroll member An oil-free scroll compressor having a plurality of compression paths from a suction port to a discharge port, and injecting water into the plurality of compression paths.
A water amount adjusting means for stopping injection of water into the plurality of compression paths in response to a command to end compressor operation;
Motor control means for stopping driving of the motor after elapse of a predetermined time after water injection into the plurality of compression paths is stopped by the water amount adjusting means. Oil-free scroll compressor.

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